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Yellowstone National Park Trophic State Analysis

Dr. Woodruff Miller, of Brigham Young University, has been sampling lakes and ponds in Yellowstone National park since 1995. Water samples have been taken from the lakes and tested for total phosphorus and chlorophyll-a concentrations. Secchi depth (a measure of water clarity) was also measured at each site. These measurements were taken in order to perform a trophic state analysis.

Trophic state classifications are an indicator of the health of a body of water, such as a lake or a pond. These classifications also tell how an ecosystem functions. Changes in trophic state indicate changes in productivity and resource availability.

The Carlson Model calculates trophic state index based off of Secchi depth, chlorophyll-a concentration, and total phosphorus concentrations.

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